| Patent application number | Description | Published |
|---|
| 20090083833 | AUTHENTICATION WITH PHYSICAL UNCLONABLE FUNCTIONS - Physical Unclonable Functions (PUFs) for authentication can be implemented in a variety of electronic devices including FPGAs, RFIDs, and ASICs. In some implementations, challenge-response pairs corresponding to individual PUFs can be enrolled and used to determine authentication data, which may be managed in a database. Later when a target object with a PUF is intended to be authenticated a set (or subset) of challenges are applied to each PUF device to authenticate it and thus distinguish it from others. In some examples, authentication is achieved without requiring complex cryptography circuitry implemented on the device. Furthermore, an authentication station does not necessarily have to be in communication with an authority holding the authentication data when a particular device is to be authenticated. | 03-26-2009 |
| 20090158054 | PRIVATE DATA PROCESSING - A method for processing one or more terms includes, at a first computation facility, computing an obfuscated numerical representation for each of the terms. The computed obfuscated representations are provided from the first facility to a second computation facility. A result of an arithmetic computation based on the provided obfuscated values is received at the first facility. This received result represents an obfuscation of a result of application of a first function to the terms. The received result is processed to determine the result of application of the first function to the terms. | 06-18-2009 |
| 20090222672 | Integrated Circuit That Uses A Dynamic Characteristic Of The Circuit - An integrated circuit has a first component that has a dynamic characteristic that varies among like integrated circuits, for example, among integrated circuits fabricated using the same lithography mask. Operating the first component produces an output that is dependent on the dynamic characteristic of the first component. A digital value associated with the integrated circuit is generated using the output of the first component, and then the generated digital value is used in operation of the integrated circuit. | 09-03-2009 |
| 20090254981 | Volatile Device Keys And Applications Thereof - A key is determined from a volatile response using circuitry on the device. The volatile response depend on process variation in fabrication of the device. Error control data that depends on the first volatile response can be computed, stored externally to the device, and then used to generate the key using a volatile response using the circuit. Applications of volatile keys include authentication and rights management for content and software. | 10-08-2009 |
| 20100127822 | NON-NETWORKED RFID-PUF AUTHENTICATION - An integrated circuit includes a sequence generator configured to generate a series of challenges; a hidden output generator configured to generate a series of hidden outputs, each hidden output a function of a corresponding challenge in the series of challenges; and bit reduction circuitry configured to generate a response sequence including a plurality of response parts, each response part a function of a corresponding plurality of hidden outputs. | 05-27-2010 |
| 20100272255 | SECURELY FIELD CONFIGURABLE DEVICE - A field configurable device, such as an FPGA, supports secure field configuration without using non-volatile storage for cryptographic keys on the device and without requiring a continuous or ongoing power source to maintain a volatile storage on the device. The approach can be used to secure the configuration data such that it can in general be used on a single or a selected set of devices and/or encryption of the configuration data so that the encrypted configuration data can be exposed without compromising information encoded in the configuration data. | 10-28-2010 |
| 20110033041 | INDEX-BASED CODING WITH A PSEUDO-RANDOM SOURCE - Outputs from at least one pseudo-random source are used to encode hidden value. The hidden value is encoded using index based quantities, for example, based on numerically ordering a sequence of outputs from pseudo-random source(s). In some examples, the numerical ordering of re-generated device-specific quantities is used to re-generate the hidden value, without necessarily requiring additional error correction mechanisms. Information leak may be reduced by constructing system whose “syndrome” helper bits are random, as measured, for example, by NIST's Statistical Tests for Randomness In some examples, index based coding provides coding gain that exponentially reduces total error correction code complexity, resulting in efficiently realizable PRS-based key generation systems. In some examples, index based coding allows noisy PRS to be robust across conditions where conventional error correction code cannot error correct. | 02-10-2011 |
